Body cavity is the cavity present between body wall and gut wall. In some animals the body cavity is not lined by mesoderm. Such animals are called ________________.
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Acoelomates are characterised by absence of coelom or body cavity while coelomates are those organisms where mesoderm lines the coelom. Pseudocoelomates are those, which have a body cavity (derived from blastocoel of embryo) but is not lined with mesoderm, e.g., roundworms.